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Graphics programming under Windows with Delphi.


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How many colors can the graphic card display?

You can use WIN API function GetDeviceCaps() to calculate the number of colors supported by the current video mode*). This function will return the number of maximum simultaneous colors current video device can handle. The var parameter will be set to the the number of bits per pixel or 0 in case of an error.

function GetColorsCount (var bitsperpixel : integer) : longint;
   h : hDC;
   Result := 0;
   bitsperpixel := 0;
     h      := GetDC(0);
     bitsperpixel := GetDeviceCaps(h, PLANES) *
                       GetDeviceCaps(h, BITSPIXEL);
     Result := 1 shl bitsperpixel;
     ReleaseDC(0, h);

*) Look at the ChangeDisplaySettings routine (in the Win32 API help) to change the mode at runtime

Generated 20:02:04 on Aug 3, 2020